To be honest I can't. The reality is that RO filters are expensive. I have a $400 one which does like 350 gallons a day allegedly but to fill up my 55 gallon rez takes over 4-5 hours at least. They are slow. Totally worth it, but I honestly don't know of any cheap alternative to spending the money up front.

One thing I like to recommend is to go to your local Walmart, grocery store etc and fill up 5 gallon water bottles as they will sell you RO water for like $.0050 – $1.00 a gallon.

That's an impressive product and very well explained. Thank You!
$30 seems a little pricey but obviously it does what it claims to do and does it well.
But if one is going to invest in hydroponics, knowing what the water is like is very important, so $30 is cheap.

Thank you so much for the video! I'm starting dental school soon and I wanted to do a project like this in my small apartment. This video is exactly what I was looking for. :). I do have a suggestion. Could you make a video or comment on lighting? I didn't understand how you installed everything. Or what you meant about the aluminum. It looked like it was still at the base of light fixture. Thank you again. subscribe﻿